I found these growing in the neighbors' yard 9/30/2006. They are seriously orange and since orange is my favorite color I had to take some pictures. The average mushroom cap is about 3-4 inches; in diameter and they stand about 3 inches; tall. No, I didn't eat any. Im no expert on mushrroms but I think these are Jack O'Lantern Mushroom (Omphalotus olearius), but I could be wrong.